Final answer:
The price for each keepsake is $17.50.
Step-by-step explanation:
To find the price for each keepsake, we can substitute the given values into the equation: p = 1800/s + 10. Since the class buys 240 keepsakes (s = 240), we substitute this value into the equation:
p = 1800/240 + 10
Simplifying the equation, we get:
p = 7.5 + 10
Therefore, the price for each keepsake is $17.50.